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Development of high-J(c) NbTi multifilamentary superconducting wire with Nb artificial pins for ac applications

ELECTRICAL engineering IN JAPAN 1996年第3期116卷 1-13页

作者： Miura, O Inoue, I Matsumoto, K Tanaka, Y The Furukawa Electric Co. Ltd. Graduated in 1988 from the Physics Department of the School of Natural Sciences Tokyo Metropolitan University. Joined Furukawa Electric Co. Ltd. in April of 1988. He is engaged mainly in R&D of superconducting wires and magnets. Currently working in the Electrical Engineering Division in Tokyo Metropolitan University. He is a member of Low Temperature Engineering Society. Graduated in 1972 from the Applied Solid State Engineering Department Osaka University. Joined Furukawa Electric Co. Ltd. in April 1972. He is engaged mainly in R&D of superconducting wires. Currently Division Director ProductionTechnology Division Department of Superconducting Products Industrial Department of New Devices Department of Superconducting Products Furukawa Electric Co. Ltd. M.E. degree from the Engineering Research Department Kyoto University in May 1984. Joined Furukawa Electric Co. Ltd. in April 1984. He is engaged mainly in R&D of superconducting materials and electromagnetic properties. Currently Senior Researcher at the Corporate Research and Development Center of Furukawa Electric Co. Ltd. Ph.D. degree from the Engineering Research Department Osaka University in March 1971. Joined Furukawa Electric Co. Ltd. in April 1971. He is engaged mainly in R&D of superconducting materials and wires. Currently Executive Director Superconductor R&D Division of the Corporate Research and Development Center Furukawa Electric Co. Ltd.

High critical current densities of 1.61 x 10(10) A/m(2) at 1 T, 6.1 x 10(9) A/m(2) at 3 T and 2.9 x 10(9) A/m(2) at 5 T were achieved by controlling the distribution of Nb artificial pins in NbTi multifilamentary superconducting wires for ac applications. The critical current densities attained are over two times higher than those of conventional ac superconducting wires. This increase can be attributed to the shift of the peak of pinning force density to higher magnetic field by optimizing the pinning parameters. The benefits of increasing critical current densities for ac applications are demonstrated. A 2.5 T/100 kVA ac superconducting magnet was designed and made by using high Je wire with controled distribution of Nb artificial pins. Compared with conventional ac superconducting magnets, the new magnet exhibits a drastic decrease in size as well as in ac losses.

关键词： artificial pinning centers critical current density NbTi superconducting ac devices ac superconducting magnets

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ANALYSIS OF LEAKY AQUIFER PUMPING TEST DATA - AN AUTOMATED NUMERICAL-SOLUTION USING SENSITIVITY ANALYSIS

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GROUND WATER 1982年第3期20卷 325-333页

作者： COBB, PM MCELWEE, CD BUTT, MA Kansas Geological Survey 1930 Ave. A Campus W. The University of Kansas Lawrence Kansas 66044. Patrick M. Cobb received B.S. degree in Geophysics in 1976 and M.S. degree in Water Resources Science in 1980 both from the University of Kansas. The thesis topic was natural salt-water intrusion in the Great Bend Prairie in south-central Kansas. Since 1979 he has been employed by the Kansas Geological Survey in the Geohydrology Section. The hydrology of the Great Bend Prairie and applied numerical modeling are continuing topics of interest. Carl D. McElwee graduated in 1965 from William Jewell College with a B.A. in Physics. He received M.A. and Ph.D. degrees from the University of Kansas in 1967 and 1971 respectively. His research area was solid-state physics. From 1971 to 1974 he worked for Texaco Inc. in Houston Texas as a research geophysicist. Since 1974 he has worked for the Kansas Geological Survey in the Geohydrology Section. His area of special interest is ground-water models. Munir A. Butt graduated in 1969 from Regional Engineering College Kashmir with B.E. (Civil). He received M.E. degree from Roorkee University India in 1973 and M.S. degree in Water Resources Engineering from the University of Kansas in 1977. From 1969 to 1975 he worked as Assistant Engineer Kashmir Irrigation and Flood Control Department. Presently he is at the University of Kansas and works as research assistant for the Kansas Geological Survey in the Geohydrology Section.

The Kansas Geological Survey is pursuing an effort to automate some of the more common methods of aquifer pumping-test analysis. This paper discusses the results of work done on the leaky artesian aquifer as defined by Hantush and Jacob (1955). The paper covers the basic theory of the aquifer type, the numerical solution of the leaky artesian-well function, and the methodology of achieving the “best fit” parameters in the least squares' sense. Several data sets are used to demonstrate the applicability of the proposed technique. These examples indicate the generally satisfactory results produced by the automated analysis documented here. The algorithm has good convergence properties. Initial estimates for the aquifer parameters may vary by about three orders of magnitude above or below the correct values. For typical data sets the rms fitting error should be less than a few tenths of a foot. If this is not the case, one is probably not dealing with a simple leaky aquifer. This method of pumping-test analysis does not eliminate the role of an experienced hydrologist to define the local hydrogeology and aquifer type. However, once the decision is made as to which aquifer configuration is being observed, this program will, in a quick and unbiased fashion, give an accurate assessment of the leaky-aquifer parameters within the limits of the theoretical approximations and the data quality.

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